Study on the characteristic features of the recent variation of mountainous heavy rainfall and discussion on the mechanism using numerical modeling

• Project/Area Number: 20540420
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Gunma University
• Principal Investigator: IWASAKI Hiroyuki Gunma University, 教育学部, 教授 (70261823)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2008: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 気候変動 / 豪雨 / 局地循環 / 積乱雲 / AMeDAS / 山岳 / 強雨 / 水蒸気 / アメダス / 熱的局地循環 / 地球温暖化

Research Abstract

The significant positive trend in nocturnal heavy rainfall was found over around the southeastern foot of the mountains in the northern Kanto district through the analysis of 31 years' worth of AMeDAS data. In addition, the specific humidity at 850 hPa also increased on convective days. A numerical study elucidated that the cumulonimbus clouds around the southeastern foot of the mountains became active in the night when specific humidity increased. It is suggested that recent increase in specific humidity is the cause of recent positive trend of heavy rainfall.

Research Products

• [Journal Article] Recent positive trend in heavy rainfall in eastern Japan and its relation with variations in atmospheric moisture. (2011)
  • Author(s): Iwasaki H.
  • Journal Title: Int.J.Climatol. (in print.)
  • Peer Reviewed
• [Journal Article] A study on the influence of soil moisture on deep convection around Ulaanbaatar, Mongolia, as an arid environment using AMSR-E soil moisture. (2011)
  • Author(s): Iwasaki H., H.Fujii
  • Journal Title: J.Meteor.Soc.Japan(A) 89 Pages: 97-109
  • NAID: 130004788767
  • Peer Reviewed
• [Journal Article] Recent positive trend in heavy rainfall in eastern Japan and its relation with variations in atmospheric moisture (2011)
  • Author(s): H.Iwasaki
  • Journal Title: International Journal of Climatology Volume: 31(印刷中)
  • Peer Reviewed
• [Journal Article] A study on the influence of soil moisture on deep convection around Ulaanbaatar, Mongolia, as an arid environment using AMSR-Esoil moisture. (2011)
  • Author(s): Iwasaki, H., H.Fujii
  • Journal Title: J.Meteor.Soc.Japan Volume: 89A Pages: 97-109
  • NAID: 130004788767
  • Peer Reviewed
• [Journal Article] Study of recent variation in weak rainfall over Japan using 31-year AMeDAS dataset. (2009)
  • Author(s): Iwasaki H, Y.Yoshinobu
  • Journal Title: SOLA 5 Pages: 157-159
  • NAID: 130004448496
  • Peer Reviewed
• [Journal Article] モンゴル・ウランバートル周辺における土壌水分が積乱雲活動に与える影響---AMSR-E土壌水分量の気象学への応用--- (2009)
  • Author(s): 岩崎博之・藤井秀幸
  • Journal Title: 2009土壌水分ワークショップ論文集 Pages: 17-20
  • Peer Reviewed
• [Journal Article] Study of Recent Variation in Weak Rainfall over Japan Using 31-Year AMeDAS Dataset (2009)
  • Author(s): H.Iwasaki, Y.Sunaga
  • Journal Title: SOLA(Scientific Online Letters on the Atmosphere) 5 Pages: 157-159
  • NAID: 130004448496
  • Peer Reviewed
• [Journal Article] NDVI prediction over Mongolian grassland using GSMaP precipitation data and JRA-25/JCDAS temperature data. (2009)
  • Author(s): Iwasaki, H.
  • Journal Title: J. Arid Environment. 73 Pages: 557-562
  • Peer Reviewed
• [Presentation] AMeDASデータを用いた近年の強雨増加の地理的特徴 (2010)
  • Author(s): 岩崎博之
  • Organizer: 日本気象学会春期大会
  • Place of Presentation: 東京
  • Year and Date: 2010-05-25
• [Presentation] AMeDASデータを用いた近年の強雨増加の地理的特徴 (2010)
  • Author(s): 岩崎博之
  • Organizer: 日本気象学会2010年度春季大会
  • Place of Presentation: 国立オリンピック記念青少年総合センター(東京)
  • Year and Date: 2010-05-25
• [Presentation] AMeDASデータを用いた弱雨の経年変化の地理的特徴の研究 (2009)
  • Author(s): 岩崎博之・須永吉信
  • Organizer: 日本気象学会秋期大会
  • Place of Presentation: 福岡
  • Year and Date: 2009-11-26
• [Presentation] AMeDASデータを用いた弱雨の経年変化の地理的特徴の研究 (2009)
  • Author(s): 岩崎博之・須永吉信
  • Organizer: 日本気象学会
  • Place of Presentation: 福岡
  • Year and Date: 2009-11-26
• [Presentation] AMeDASデータを用いた強雨の経年変化の解析---山岳と強雨増加の関係--- (2009)
  • Author(s): 岩崎博之
  • Organizer: 日本気象学会春期大会
  • Place of Presentation: つくば
  • Year and Date: 2009-05-28
• [Presentation] AMeDASデータを用いた強雨の経年変化の解析-山岳と強雨増加の関係- (2009)
  • Author(s): 岩崎博之・須永吉信
  • Organizer: 日本気象学会
  • Place of Presentation: つくば
  • Year and Date: 2009-05-28
• [Presentation] 2009:モンゴル・ウランバートル周辺における土壌水分が積乱雲活動に与える影響---AMSR-E土壌水分量の気象学への応用--- (2009)
  • Author(s): 岩崎博之・藤井秀幸
  • Organizer: 2009土壌水分ワークショップ
  • Place of Presentation: 東京
  • Year and Date: 2009-03-28
• [Presentation] モンゴル・ウランバートル周辺における土壌水分が積乱雲活動に与える影響-AMSR-E土壌水分量の気象学への応用- (2009)
  • Author(s): 岩崎博之・藤井秀幸
  • Organizer: 2009土壌水分ワークショップ
  • Place of Presentation: 東京
  • Year and Date: 2009-03-28
• [Presentation] NDVI prediction over Mongolian grassland. using AMSR-E soil moisture, GSMaP precititation and JRA/JCDAS temperature (2009)
  • Author(s): Iwasaki, H.
  • Organizer: GCOM Workshop 2009
  • Place of Presentation: 横浜
  • Year and Date: 2009-01-13
• [Presentation] 乾燥域における土壌水分量が積乱雲活動に与える影響-AMSR-E土壌水分量の気象学への応用- (2008)
  • Author(s): 岩崎博之・藤井秀幸
  • Organizer: 2008年日本気象学会秋期大会
  • Place of Presentation: 仙台
  • Year and Date: 2008-11-29
• [Presentation] 日乾燥域における土壌水分量が積乱雲活動に与える影響---AMSR-E土壌水分量の気象学への応用--- (2008)
  • Author(s): 岩崎博之・藤井秀幸
  • Organizer: 日本気象学会秋期大会
  • Place of Presentation: 仙台
  • Year and Date: 2008-11-19
• [Presentation] GSMaP降水量とJCDAS地上気温を用いだモンゴルのNDVI分布の1ヶ月前予測の可能性 (2008)
  • Author(s): 岩崎博之
  • Organizer: 2008年日本気象学会春期大会
  • Place of Presentation: 横浜
  • Year and Date: 2008-05-20